How to determine whether a three dimensional vector field is conservative?

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Does it have something to do with the partial derivatives of the vector field's components and equating them?

E.g: derivate i component for x, j for y, k for z, and seeing whether they equal each other?

Thanks and pardon my English :)

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A vector field $f=f_{1}(x,y,z)i+f_{2}(x,y,z)j+f_{3}(x,y,z)k\,\,$ is

conservative if-f

$\bigtriangledown \times f=\begin{vmatrix} i& j & k \\ \frac{\partial }{\partial x}& \frac{\partial }{\partial y} &\frac{\partial }{\partial z} \\ f_{1}(x,y,z)&f_{2}(x,y,z) &f_{3}(x,y,z) \\ \end{vmatrix}=0$